One day, Tama, a lazy man, receives a message from his friend Renafalt, whom he had met on the Internet for five years, but never seen in person. The message asked him, “Senpai, would you like to hire a home security guard?" Tama, who was convinced that “Renafalt is 200% a man,” found a person with a red suitcase at the arranged meeting place. However, the person turns out to be a beautiful girl with big breasts. "Ah...um...are you my senpai?" The start of a strange cohabitation story between an apathetic man who wants to live quietly in his corner of the world, and a JK with a comical disorder! (Source: Comic Ride, translated)